The Size(mm) option follows the format M6 × Leg Length × Inside Width. For example, M6x50x80 means an M6 thread, 50mm (≈2.0") leg length, and 80mm (≈3.1") inside width. Measure the outer diameter of the pipe or bar you are clamping, then select an inside width that matches. For leg length, make sure it is long enough to pass through your mounting plate with at least 10mm of thread engagement remaining for the nuts — generally more is better for vibration-prone applications like trailers.

These U-bolts are made from A2 stainless steel, which corresponds to AISI 304. A2/304 stainless steel generally offers good corrosion resistance in most environments, including mild marine and outdoor exposure. For highly aggressive saltwater or chemical environments, A4/316 stainless steel is typically recommended instead.

Yes. A2 (304) stainless steel is generally suitable for outdoor use and light marine environments — it resists rust and oxidation well under normal weather conditions. For prolonged direct saltwater immersion or highly corrosive chemical exposure, A4 (316) grade is typically the preferred choice. These are a solid option for trailer hardware, outdoor pipe clamping, and similar applications.

These U-bolts use the M6 metric coarse thread (ISO metric), the most widely used thread standard internationally. The included nuts are matched to the same M6 metric thread, so no additional hardware is needed for a standard installation. They are compatible with any standard M6 metric hex nut or flange nut.

Each set includes one U-bolt, one flat mounting plate, and two hex nuts — everything needed for a complete installation. The quantity option (3pcs, 5pcs, 6pcs, 10pcs, 12pcs, 15pcs, 20pcs, 25pcs) refers to the number of complete sets in the package. For example, selecting "10pcs" means you receive 10 U-bolts, 10 plates, and 20 nuts.

The load capacity of an M6 U-bolt depends on the material grade, installation method, and application. In general, M6 stainless steel U-bolts are suitable for light-to-medium duty clamping and securing tasks such as pipe clamping, conduit securing, and trailer component mounting. For safety-critical or high-load structural applications, always consult an engineer and verify the working load limit for your specific setup before installation.

Yes. M6 stainless steel U-bolts are commonly used on trailers for securing pipes, cables, conduit, and other components to the frame. The stainless steel construction helps resist road grime, moisture, and vibration over time. Always verify that the selected size and load rating are appropriate for your specific trailer application, and re-torque the nuts after initial use as hardware can settle under load.

Absolutely. U-bolts with a flat plate and nuts are a classic solution for pipe clamping, conduit securing, and round-bar mounting. Select an inside width that closely matches the outer diameter of your pipe for a secure, rattle-free fit. The flat plate distributes clamping force evenly, reducing the risk of deforming thin-wall pipe or tubing.